[BUG] Column Escaping Doesn't Work with `NOT` Well

[Moginu]

Describe the bug Now dbtvault wraps all the columns with quotes, but not would be in the quotes as well.

Versions

dbt: 1.0.4 dbtvault: 0.8.2

To Reproduce

 {{
     dbtvault.stage(
         source_model = "source_model",
         hashed_columns = {
             "hk_a": "id",
             "a_hashdiff": {
                 "is_hashdiff": true,
                 "columns": [
                     "a",
                 ]
             }
         },
         derived_columns = {
             "derived_column_a": "not column_a",
         },
     )
 }}

The compiled SQL would be like:

derived_columns AS (
    SELECT

    "not column_a" AS "eff_flag",

   FROM source_data
),

Expected behavior The not should be outside the quotes like:

derived_columns AS (
    SELECT

    not "column_a" AS "eff_flag",

   FROM source_data
),

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Log files If applicable, provide dbt log files which include the problem.

Additional context Add any other context about the problem here.